Yesterday, While logging in to my Linux Mint(cinnamon) I noticed that my task bar has been missing. And when I open any window, there is no close/minimize/maximize button. All this sounds weird to me.

I tried rebooting. No change. I have no issue while logging in using gnome classic. All works.

I did not remember of something that I had changed recently. While digging on the internet for this I just found an odd question on mint forum. But unfortunately no answers. Can someone show some light into this?

Additional information:

While logging to my system i got window saying /tmp is not present or cannot recover /tmp - i dont remember it.